How to replace autogenerated firebase node id to the current user email

Question

I'm trying to replace autogenerated firebase node id to the current user email please check code below, I'm using firebase realtime database

Code:

mAuth.createUserWithEmailAndPassword(demail, dpass)
    .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (task.isSuccessful()) {
                User user = new User(dname, demail, dcontact, dcity, dage);

                FirebaseDatabase.getInstance().getReference("doctors")
                        .child("Doctors_Registration")
                        .child(FirebaseAuth.getInstance().getCurrentUser().getUid())
                        .setValue(user)
                        .addOnCompleteListener(new OnCompleteListener<Void>() {
                            @Override
                            public void onComplete(@NonNull Task<Void> task) {
                                
                                if (task.isSuccessful()) {
                                    Toast.makeText(signup.this, "Doctor Registered", Toast.LENGTH_SHORT).show();
                                    progressBar.setVisibility(View.GONE);
                                } else {
                                    Toast.makeText(signup.this, "Failed to Registered, Try Again!" + task.getException(), Toast.LENGTH_LONG).show();
                                    progressBar.setVisibility(View.GONE);
                                }
                            }
                        });